Negotiating stairs with an inconsistent riser: Implications for stepping safety
Natasha C. Francksena | Thijs M. A. Ackermansa | Denis Holzerab | Sophia A. Ebnera | Constantinos N. Maganarisa | Mark A. Hollandsa | Kiros Karamanidisc | Mike Roysd1 | Thomas D. O'Briena
aResearch to Improve Stair Climbing Safety (RISCS), Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
bDepartment of Biomechanics in Sports, Faculty of Sport and Health Sciences, Technical University Munich, Munich, Germany
cSport and Exercise Science Research Centre, School of Applied Sciences, London South Bank University, London, UK
dRise and Going Consultancy, Watford, UK
Highlights
- Old and young do not alter stepping behaviour before an inconsistently higher step.
- 10 mm inconsistent high riser reduces foot clearance in ascent, increasing trip risk.
- And reduces foot contact length in descent, increasing overstep and then slip risk.
- Neither group detected or adjusted their stepping aptly to these inconsistencies.
- Ensure consistent risers exist within design, construction and installation phases.
Stairs are associated with falls, especially when step dimensions are inconsistent. However, the mechanisms by which inconsistencies cause this higher risk are mostly theoretical. In this experimental study we quantified the effect of inconsistent rise heights on biomechanical measurements of stepping safety from younger (n = 26) and older adults (n = 33). In ascent, both groups decreased foot clearance (~9 mm) over the inconsistently higher step (F(1,56) = 48.4, p < 0.001). In descent, they reduced foot contact length on the higher step by 3% (F(1,56) = 9.1, p < 0.01). Reduced clearance may result in a toe-catch potentially leading to a trip, while reduced foot contact lengths increase the risk of overstepping which may also lead to a fall. These effects occurred because participants did not alter their foot trajectories, indicating they either did not detect or were not able to adjust to the inconsistent rise, increasing the likelihood of a fall. Consistent stair construction is vital, and existing inconsistencies should be identified and safety interventions developed.
